https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100539
Bug ID: 100539 Summary: wrong code at -Os and above with "-fno-dce -fno-inline-small-functions -fno-tree-dce" Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: zhendong.su at inf dot ethz.ch Target Milestone: --- [514] % gcctk -v Using built-in specs. COLLECT_GCC=gcctk COLLECT_LTO_WRAPPER=/local/suz-local/software/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/12.0.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: ../gcc-trunk/configure --disable-bootstrap --prefix=/local/suz-local/software/local/gcc-trunk --enable-languages=c,c++ --disable-werror --enable-multilib --with-system-zlib Thread model: posix Supported LTO compression algorithms: zlib gcc version 12.0.0 20210511 (experimental) [master revision 15e6b45c9ad:45dc47d4720:cf43636a74a028daf2024b33d1915274a2ff9655] (GCC) [515] % [515] % gcctk -Os small.c; ./a.out [516] % [516] % gcctk -Os -fno-dce -fno-inline-small-functions -fno-tree-dce small.c [517] % ./a.out Segmentation fault [518] % [518] % cat small.c int a, b; static void c(int *d) { int e = 0; for (; a < 1; a++) e |= (b == *d); } int main() { int g = 0; c(&g); return 0; }